Beijing ? Beijing will use artificial rainmaking to clear the air after a choking dust storm coated China’s capital and beyond with yellow grit, prompting a health warning to keep children indoors, state media said Tuesday.

The huge storm blew dust far beyond China’s borders, blanketing South Korea and reaching Tokyo.

The storm, reportedly the worst in at least five years, hit Beijing overnight Sunday, turning the sky yellow and forcing residents to dust off and hose down cars and buildings.

Hospitals reported a jump in cases of breathing problems, state television said.

The government was preparing to seed clouds to make rain to clear the air, state TV said, citing the Central Meteorological Bureau. It did not elaborate, and the bureau refused to release more information.

Storms carrying chalky dust from the north China plain hit Beijing every spring, but newspapers said this week’s was the heaviest since at least 2001.